Buttonhole-sewing machine



April 30, 1929- J. w. CONNORS 1,710,765

BUTTONHOLE SEWING MAUI-II NE Filed Sept. 29, 1927 2 Sheets-Shea; 1

l 25 i 26 m. InvenTor.

2| John W. Connors g -20 W Maw ATTys.

April 30, 1929. J w, 0 o 1,710,765

BUTTONHOLE SEWING MACHINE Filed Sept. 29, 192'? 2 Sheets-Shem 2 Fig.8.

InvenTor. LJohn WConnorsbyMwl M v ATTys.

Patented Apr. 30, 1929.

UNITED STATES PATENT OFFICE.

JOHN W. CONN 038, OF DEDHAM, MASSACHUSETTS, ASSIGNOR TO THE REECE BUTTON HOLE MACHINE COMPANY, OF BOSTON,

MAINE.

MASSACHUSETTS, A CORPORATION OF BUTTONHOLE-SEWIN G MACHINE.

Application filed September 29, 1927. Serial No. 222,879.

This invention relates to huttonhole sewing machines and particularly to a buttonhole cutting mechanism of the type adapted to cut a buttonhole slit with an eye at one end.

In cutting a buttonhole slit of this type the huttonhole cutter cuts from the cloth or other piece of work a small cloth fragment at the place where the eye formed and the cutter is usually provided with a delivery passage into which this cloth fragment enters and through which it passes to the outside of the cutter. It sometimes happens, however, that the cloth fragment will not remain in the passage when the cutter is raised but will adhere to the work in which case the fragment is liable to be sewed into the buttonhole thus producing imperfect Work.

It has been proposed to avoid this difficulty by providing an ejector which is associated with the cutter block and which positively forces the cloth fragment as each buttonhole is cut into said delivery passage.

My present invention relates to improved means for actuating the ejector.

In order to give an understanding of the invention I have illustrated in the drawings a selected embodiment thereof which will now he described after which the novel features will be pointed out in the appended claims.

Fig. 1 is a fragmentary sectional view of a portion of a huttonhole sewing machine embodying my invention and showing the cutter raised;

liig. 2 is a :t'ragmentary View showing the operation of the ejector, the cutter block, and cutter being shown in section;

Fig. 3 is a section on substantially the line 3--3, Fig. 1;

Fig. 4 is a view similar to Fig. 2 showing a modification of the invention but illustrating the cutter block in side elevation;

Fig. 5 is a top plan view of Fig. 4;

Fig. 6 is a section on the line 66, Fig. .3.

Fig. 7 is an under side view of the cutter.

Inasmuch as the present invention relates simply to the huttonhole cutter of a buttonhole sewing machine I have not thought it necessary to illustrate the complete machine herein but have shown only such parts of a huttonhole sewing machine as is necessary to enable my invention to be understood.

In the drawings 1 indicates portions of the frame of a buttonhole sewing machine which carr the Stitch-forming mechanism, the latter, iowever, not being herein shown as it forms no part of the present invention, although it might be stated that the stitchforming mechanism comprises the usual upper needle and also under thread handling mechanism which is mounted on a turret in dicated generally at 2 and carried by hearings 3 in the frame 1. During the sewing around the eye of the buttonhole the stitchforming mechanism including the turret 2 is given a partial rotation as usual in buttonhole sewing machines and such rotation is derived from a vertically-arranged oscillatory shaft 4 1 and which is connected by suitable gearing with the turret and the needle baccarrier all as usual in buttonhole sewing machines and as will be readily understood by those skilled in the art. I I

The buttonhole cutter which is of the usual construction is shown at 6 and it is carried by a cutter arm 7 that is pivoted to the frame 1 at 8. (Jo-operating with the cutter 6 is a cutter block 9 which is carried by a suitablesupporting bracket 10 that is see cured to the frame 1. The cutter is provided with the cutting edge 11 which cuts the slit of the buttonhole and which terminates at one end in an eye-forming portion 12 which cuts out theeye ofthe buttonhole. The buttonhole cutter 6 is provided with a delivery passage 16 leading inwardly from the eye-forming portion 12 and communicating with an outlet or dischar e passage 17 formed in the arm 7, the disc l l 17 opening through the side of the arm, all as usual in buttonhole cutters of this type.

The cutter arm 7 is given a rocking movement about its pivot 8 at the proper time in the sewing cycle thereby to bring the cutter 6 against the cutting block 9 and cut the buttonhole slit in the work 13 as will i be readily understood by those skilled in the art.

Associated with the cutter block 9 there which is carried by the frame large passage is an ejector 14 in the form of a pin which operates vertically through said block and is situated in line with the eyeforming portion 12 of the buttonhole cutter.

Means are provided whereby while the cutter is in its cutting position against the block 9 the ejector will be raised as shown in Fig. 2 whereby the cloth fragment 15 Wlllth is out out in forming the eye of the buttonhole will be forced up into the delivery passage 16 thereby clearing said fragment from the work and avoiding any possibility that it will. remain inv the work when. the cutter is raised and. thereby become sewed into the buttonhole.

In my present invention I have provided. for actuating the ejector M from the oscillatory shaft 4t by which the stitch-forming n'leclranisn'l is given its rotary movement.

In Figs. 1. 2 and 3 I have shown one simple way in which this may be acco1nplished. The ejector it is secured to and rises from a plunger 18 which operates in a recess formed in the bracket 10, said plunger having a h ad. 19 at its lower end which is engaged by a spring 20 that normally tends to hold the ejector in its depressed or inoperative position shown. in Fig. 1.

The plunger 18 has a pin 21 extending laterally therefrom and; operating in a slot .22 formed it the su iporting bracket 10, said. pin projecting beyond. the supporting bracket. The projecting end of the pin is received in a slot 23 formed in the end of a lever 21 which pivoted. to the supporting bracket 10 at Said lever provided at its cndavith a cam surface 26 which. adapted to be engaged. by a projection. 27 carried by a collar 28 that is fast on the shaft at. As the shaft rotates the collar from the position shown in Fig. l to that shown in Fig. 9. the pin. 27 will by its engagement with. the cam face 26 depress the left hand end of the lever 24: thereby raising the right hand end and elevating the ejector 14 against the action of the spring 20.

In some buttonhole sewing machines the bnttonhole cutter is actuated when the machine tirst started and before the stitchforming mechanism is set inv operation while in other machines the butitonhole cutter is actuated after the stitch-forming operation has been completed. In either case there is commonly a turning movementof the shaft t at the time that the buttonholc cutter is being operated, such turning movement operating to restore the stitch-forming mechanism to proper position for stnving the buttonhole, itbeingunderstood that the said stitch-forn'iing inechanism has been turned in. sewing around the ends of the buttonhole.

The turning movement which is thus given to the shaft 4: at the time that the buttonhole is being cut operates the lever 24 through the pin. 27 and cam face 26 thereby raising the ejector and this raising move mentoccurs while the cutter is in its cutting position against the cutter block as shown in Fig. 2. As a result ofthis operation the cloth fragment which is cut from the work 13 by the eye-forming portion 12 of the cutter is forced positively into the passage 16 and is thus prevented from being retained by the work as the cutter rises.

In Figs. e]: and 5 I have shown a little dit" fereiiit embodinwnt of the invention. .In this embodiment the ejector is given its vex--- tical movement by a sliding actuator 29 which is slidahly mounted on the sup iorting brarlmt l0 and is provided with a ram sur- :lare #30 adapted to engage the pin 21 as the slide is moved from full to dotted. line posi tion Fig. 5. The slide is provided with a guiding slot 3?, which receives a guiding stud carried by the luau-hot l0 and the slide is acted on by a spring 3t which. normally tends to hold. it in its rearward position shown in Fig. 4t. The operative movement of the slide from the fullto the dotted line position Fig. 5 is secured by a cam member 31 mounted on the shaft at. This member 3]. is provided with a shoulder situated to engage the end of the slide 29 as the shaft 1- is turned. During the cutting of the buttonholc th shaft t will turn from the full to the dotted line position Fig. 5 and willv subsequently have a; reverse turning movement to restore the stitch-forming mechanism to normal position, and during its rotation from the full. to the dotted line position the slide 539 is actuated to raise the ejector into the position shown in Fig. 2, this movt-unent occurring while the cutter in its cutting position against the cutter block 9.

It will be observed that by means of my invention the ejector is actuated directly by the shaft at and the construction is simple and one involving relatively few parts.

I claim:

1. Int buttonhole sewing machine having a cuttmg block, a

buttonhole cutter co- (illtt'fltllig tlnirewith and provided with an eye-forming portion and a delivery passage leading from said eye-forming portion, an oscillatory shaft by which the stitcltforming mechanism is given a turningmovement,

the combination with said cutter, cutting block and shaft, of an eject-or operating through the block for forcing into said passage the cloth fragment cut out by the cycforming portion of the cutter and means on said shaft to actuate said ejector as the shaft turns.

2. In a huttonholc sewing machine having a cutting block, a buttonhole cutter co-opcrating therewith and provided with an cyeforming portion and a delivery passage leading from said. eyeforming portion, an oscillatory shaft by which the stitch-forming mechanism is given a turning movement at the ends of the buttonhole, the combination. with said. cutter, cutting block and shaft, of an ejector operatingthrough the block for forcing into said passage the cloth fragment cut out by the eye-forming portion of the cutter, an ejector actuator, and ejectoro 'ieratmg means actuated directly from said shaft.

3. In a buttonhole sewing machine having a cutting block, a buttonhole cutter co operating therewith and provided with an eye-forming portion and a delivery passage leading from said eye-forming portion, an oscillatory shaft by which the stitch-forming mechanism is given a turning movement,

the combination with said cutter, cutting block and shaft, of an ejector operating through the block for forcing into said passage the cloth fra ment cut out by the eyeforming port-ion o the cutter, an ejector actuator, and a projection on said shaft for giving operative movement to said actuator as the shaft turns.

In testimony whereof, I have signed my name to this specification.

JOHN W. CONNORS. 

